Display screen or a portion thereof having a graphical user interface for an isometric view of an abstraction of a system platform



The FIGURE is a display screen or portion thereof having a graphical user interface for an isometric view of an abstraction of a system platform showing our new design.

The broken lines showing the display screen or portion thereof form no part of the claimed design. The remaining broken lines showing portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof having a graphical user interface for an isometric view of an abstraction of a system platform, as shown and described. 